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I've uploaded all of the files, including some information about the keyboard matrix, source code (may require a very old version of qmk to compile) and a .hex file to be used specifically with ATMEGA32u4 boards, to my github (https://github.com/Sunshine701c/HP-200LX-Keyboard-Adapter) I've never used github, and I'm sure my usage is very amateurish. Please tell me everything I'm doing wrong.
I'm working on a project at the moment, basically sticking a raspberry pi into the case of an old 200LX palmtop computer that broke on me. The start of this project is to adapt the old keyboard so that it can be used as a standard USB keyboard. I used an old Teensy 2.0 microcontroller and kbfirmware.com (very old i know) to so this, along with a custom interposer PCB to adapt the very weird pad spacing on the keyboard connector to the Teensy.